Rebab is a two-stringed fiddle. This instrument are found in many
Muslim countries. So, it is generally being considered as an foreign instruments in
Indonesian gamelan.

Rebab has an almost heart-shaped body made of wood. The body is
covered with a thin layer of skin taken from the intestine or bladder of a buffalo.
The two strings are usually made of copper. In fact, what appear to be two strings
is actually a single long copper string wound around the bottom of the stick and ending in
two pegs at the upper part of the stick. These two strings pass over a wide wooden
bridge. Unlike other Asian fiddle, the two tuning pegs of Rebab are exaggeratedly
long. These two long tuning pegs will break easily, if they are not gripped closer
to the neck of the instrument.

During playing, the player's palm, which hold the bow, is facing
upwards. The player's third and fourth fingers should pull the hair of the bow, to
create some tension. The Rebab is held vertically, or slightly tilting forwards.
There is no finger board on the neck of this instrument. The player's fingers
press the strings lightly, and the string should not touch the neck. However, this
instrument can produce a fairly loud sound.